The Math Behind Infinite Returns: Cap Rate, Cash-Out Refi, and BRRRR for Apartments

Apartment Investing 101, Part 3

If you’ve been following this series, you already know two things:

  1. Apartment buildings are valued by income, not comps
  2. You can engineer that value yourself through smart operations

Now comes the part that sounds too good to be true — but is actually just math.

What if you could own an asset with none of your own money still in the deal?

That’s what people mean when they say “infinite return.” And no, it’s not a scam. It’s a refinance strategy. Let me walk through how it actually works.


Quick Recap: The BRRRR Strategy for Apartments

You’ve probably heard of BRRRR for single-family homes — Buy, Rehab, Rent, Refinance, Repeat. The same framework applies to multifamily, but the value-add piece works differently.

With a house, you’re rehabbing to match comps. With an apartment building, you’re rehabbing and optimizing operations to raise NOI. Both matter. And together, they create a bigger value jump than either would alone.


The Numbers: A Real-ish Example

Let’s say you find a 16-unit building listed at $1,300,000. It’s been mismanaged — deferred maintenance, below-market rents, no pet fees, owner paying all utilities.

At acquisition:

  • Current NOI: $87,750/year
  • Cap rate in the area: 6.75%
  • Implied value: $87,750 ÷ 0.0675 = $1,300,000

You put down 20% plus closing costs — roughly $260,000 out of pocket.


Year One: The Value-Add Work

Over the next 12 months you:

  • Fix deferred maintenance
  • Bring rents to market rate gradually
  • Add pet fees, implement RUBS, enforce late fee policy
  • Renegotiate vendor contracts

New NOI: $128,250/year

New value: $128,250 ÷ 0.0675 = $1,900,000

You just created $600,000 in equity through operations. Not luck. Not a hot market. Math.


The Refinance: Getting Your Money Back

Now you go to a lender and refinance based on the new appraised value of $1,900,000.

Most commercial lenders will lend up to 75% LTV on a stabilized multifamily:

$1,900,000 × 0.75 = $1,425,000 loan

Your original loan was roughly $1,040,000 (80% of $1,300,000).

Cash out: $1,425,000 − $1,040,000 = $385,000 back in your pocket

You put in $260,000. You pulled out $385,000. Your original capital is fully returned — plus some.

And here’s the key part: that $385,000 is a loan, not income. No tax event.


So What’s the “Infinite Return”?

Return on investment is calculated as:

ROI = Annual Profit ÷ Capital Invested

After the refinance, your capital invested is effectively zero — you pulled it all back out. But you still own the building. The tenants are still paying down your mortgage every month. The cash flow is still coming in.

Any return on zero investment is mathematically infinite.

Now — is this realistic for everyone on day one? No. You need the deal, the financing, the operational skills, and ideally some experience under your belt first. I’m not going to sit here and tell you this is easy. But the math is real. The strategy is real. And understanding it changes how you look at every property you evaluate from here on out.


The Part Nobody Talks About: Cash Flow After Refi

One thing to watch — after you cash out refi, your new loan is bigger. Which means your monthly mortgage payment is higher. Which means your cash flow drops.

You need to make sure the property still cash flows after the refinance. This is where a lot of people get caught — they execute the BRRRR perfectly but end up with a building that barely breaks even because the new debt service ate everything.

Run the numbers before you buy. Know what NOI you need to hit to still cash flow at 75% LTV on the post-refi value. That’s your target from day one.


Putting the Whole Series Together

Over these three posts, here’s what we covered:

Part 1: Apartments are valued by income, not comps. NOI ÷ Cap Rate = Value. Every $1 in annual NOI = ~$14.80 in value at 6.75% cap rate.

Part 2: You control NOI through income diversification (pet fees, RUBS, late fees) and expense reduction (vendor renegotiation, in-house maintenance). Small changes compound into serious equity.

Part 3: Once you’ve raised NOI and increased the appraised value, a cash-out refinance lets you pull your original capital back out — tax-free — and redeploy it into the next deal. That’s how the cycle repeats.

This is the framework behind every serious multifamily investor’s portfolio growth. It’s not magic. It’s not a guru secret. It’s just understanding how commercial real estate is valued — and using that knowledge intentionally.


What’s Next for Me

I’m still in the research and positioning phase on multifamily. My entry point right now is still single-family flips — building experience, relationships, and capital. But I’m studying this framework seriously because the math is too compelling to ignore.

If you’re in the same boat — not ready to pull the trigger yet but want to understand the mechanics — I hope this series helped.

More to come.


Not financial advice — just someone doing a lot of research and asking a lot of questions.

Scroll to Top